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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - New Accounting Pronouncement, Early Adoption, Effect
$ in Millions
Dec. 31, 2015
USD ($)
Long-term Debt  
New Accounting Pronouncement, Early Adoption [Line Items]  
Debt issuance costs $ 17
Other Noncurrent Assets  
New Accounting Pronouncement, Early Adoption [Line Items]  
Debt issuance costs $ (17)